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999 <br />TR9PPER MINING INC. <br />October 7, 1992 <br />Certified #P568 1 4 1 78 1 <br />Mr Kent Gorham :~I~ ~'' ~" <br />Colo. Office oCMined Land Reclamation ^ ~'-''~ ~ +~~ •"•!'- <br />/^ ; r <br />215 Centennial Building ~ '~- ~.' <br />1313 Sherman Street ~'(~' i 1 .~ ~~ <br />Denver,C080203 ,1; ~~ <br />Dear Kent: •~._ ,, •~ - <br />Re: Trapper Mine Third Quarter (1992) Sediment Pond Inspection Report <br />Trapper's Third quarter sediment pond inspection reports far 1992 are attached. All storm event <br />runoff has passed without incident. All dams have functioned as designed. <br />The remaining dams with the principal spillway culvert design (Johnson #6, No Name #2, and No <br />Name #4) are functioning properly and show no evidence of piping. Additionally, there are no other <br />structural or erosional problems to report. <br />Since last quarter (6/30/92) Trapper has built two new sediment ponds for two NPDES drainages. The <br />Deer Gulch Dam #1 was constructed in late August and has been monitored weekly since September <br />1st. The Far East Buzzard Dam #1 is currently in the final construction phase, spillway finalization, <br />and was constructed in September. <br />Coyote Dam continued to dry up until August 4th, when all standing water was evaporated/absorbed <br />by the soil. There has been no recharge [o the pond, even with several significant thunderstorms. The <br />bottom was surveyed and remains over seven feet below the decant level. <br />All drainages have ceased to flow except No Name Gulch. Without significant precipitation events to <br />produce sufficient runoff quantities, this scenario will continue until snowpack meltant occurs. <br />In accordance with Colorado regulation 4.05.6(]3), all sedimentation ponds shall be examined by a <br />qualified registered professional engineer or other qualified individual under their direction. All <br />ponds were inspected by a competent, qualified impoundment inspector and the results of his <br />inspection findings have been reviewed by me. All minor maintenance items addressed shall be <br />corrected before permanent snow cover occurs. <br />Please call Bill Agnew or me if you have any questions or concerns <br />Sincerely, <br />/~/~ <br />James M. Mattern, P.E. <br />Chief Engineer <br />JMM/W 511/mg/M LR-107 <br />enc <br />c W Agnew <br />MW Wehmancn <br />WS Flarding <br />nD Nicholson <br />Pile <br />P.O. Box 187 Craig, Colorado 81626 (303) 824-4401 <br />